期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/11/053
关键词
cosmic singularity; cosmological perturbation theory; modified gravity
资金
- Basque Foundation of Science Ikerbasque
- Basque government (Spain) [IT956-16]
- FONDOS FEDER (Spanish government) [FIS2014-57956-P]
- Taiwan National Science Council [NSC 97-2112-M-002-026-MY3]
- Leung Center for Cosmology and Particle Astrophysics, National Taiwan University
- COST (European Cooperation in Science and Technology)
The Eddington-inspired-Born-Infeld (EiBI) model is reformulated within the mimetic approach. In the presence of a mimetic field, the model contains non-trivial vacuum solutions which could be free of spacetime singularity because of the Born-Infeld nature of the theory. We study a realistic primordial vacuum universe and prove the existence of regular solutions, such as primordial inflationary solutions of de Sitter type or bouncing solutions. Besides, the linear instabilities present in the EiBI model are found to be avoidable for some interesting bouncing solutions in which the physical metric as well as the auxiliary metric are regular at the background level.
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